AppMAc has released a new app for the Mac, mDialog 1.0. mDialog is a chat utility designed for intranet/internet chat management. Client and server versions are available and supports OS 10.1. According to AppMac:
AppMac software announce mDialog 1.0
This utility allows you to manage chat on internet or your intranet. Very cool interface with powerful notification manager. Private chat and icons for users.
You donit need a server to try it because AppMac software have a mDialog server.
There is two versions : client and server
You can find more information about mDialog at the AppMac Web site. mDialog Client is available as freeware, and the Server version is available starting at US$29.00.